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• Ant apply task (using YUI Compressor)
• Custom YUI Compressor Ant task
• Maven YUI Compressor plugin
• Granule (for JSP, JSF, Grails, Ant)
• Ant macros for Google Closure compiler
• wro4j (Maven, servlet filters, plain Java, etc)
• ant-yui-compressor (ant task for compressing JS+CSS)
• JAWR
• Minify Maven Plugin
• humpty
• Ant exec task using Terser

We are using Ant task to minify js files with YUICompressor during production build and put result into a separated folder. Then we upload those files to a web server.

Here is an example:

<target name="js.minify" depends="js.preprocess">    <apply executable="java" parallel="false">        <fileset dir="." includes="foo.js, bar.js"/>        <arg line="-jar"/>        <arg path="yuicompressor.jar"/>        <srcfile/>        <arg line="-o"/>        <mapper type="glob" from="*.js" to="*-min.js"/>        <targetfile/>    </apply></target>

I think one of the best and right tool for the job is wro4j Check out https://github.com/wro4j/wro4j

It does everything you need:

• Keep project web resources (js & css) well organized
• Merge & minify them at run-time (using a simple filter) or build-time (using maven plugin)
• Free and open source: Released under an Apache 2.0 license
• several minification tools supported by wro4j: JsMin, Google Closure compressor, YUI etc
• Very easy to use. Supports Servlet Filter, Plain Java or Spring Configuration
• Javascript and CSS Meta Frameworks Support: CoffeeScript, Less, Sass etc
• Validation: JSLint, CSSLint etc

Can run in debug as well as production modes. Just specify all the files it should handle/pre-process and it does the rest.

You can simply include merged, minified and compressed resource like this:

<script type="text/javascript" src="wro/all.js"></script>